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- Narog
- The chief river of West Beleriand. The Narog rose from the Pools of Ivrin in the Ered Wethrin, flowed south and then southeast, flowing through a gorge in a series of rapids where it crossed the hills of the Andram or Long Wall, finally meeting Sirion in the Land of Willows Nan-tathren, not far above the Mouths of Sirion. Narog's tributaries were the Ginglith in the north and the Ringwil in the Taur-en-Faroth.
- Into its western bank, just south of where Ringwil rushed into Narog, was carved the city of Nargothrond, stronghold of Finrod Felagund.
- During his time in Nargothrond, Túrin Turambar persuaded Orodreth to build a bridge over Narog. He did, but it resulted in the downfall of Nargothrond as it provided a way for the dragon Glaurung to reach the city.
- Nen Lalaith
- A stream of Dor-lómin that rose near Amon Darthir in Ered Wethrin and ran past Húrin's house.
- Nenning
- A river of the Falas. Its wells were in the hills lying north-west in West Beleriand south of the Ered Wethrin, near the Woods of Núath. It ran to the bay of Eglarest where it met the sea Belegaer.
- Nimrodel
- A river of Lothlórien. It began in the foothills of the Misty Mountains under the Celebdil peak, and then flowed through Lothlórien until it met the Silverlode. The river was named after the Elven lady Nimrodel who dwelt beside the stream.
- Ninglor
- See Gladden
- Norbourn
- A river in the Northfarthing of the Shire. Between it and Brandywine River stretched the Greenfields, where the Battle of Greenfields was fought. Norbourn is only mentioned in the detailed index Tolkien was preparing for The Lord of the Rings, but which was eventually left unfinished. In the partial map of the Shire published within The Lord of the Rings an unnamed river flows from the north to the Bywater Pool, which might possibly be Norbourn.
Read more about this topic: List Of Middle-earth Rivers